/* ===== Science Demo — modern catalog rebuild ===== */
@import url('https://fonts.googleapis.com/css2?family=Heebo:wght@400;500;600;700;800&display=swap');

:root{
  --red:#e11a3c;
  --red-dark:#b81230;
  --red-soft:#fdeef1;
  --ink:#1b2532;
  --slate:#5a6b80;
  --line:#e6eaf0;
  --bg:#f6f8fb;
  --card:#ffffff;
  --teal:#0fa3a8;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 6px 22px rgba(27,37,50,.07);
  --shadow-lg:0 16px 40px rgba(27,37,50,.13);
  --maxw:1180px;
  --header-h:72px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Heebo',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
.container{max-width:var(--maxw);margin-inline:auto;padding-inline:22px}
.muted{color:var(--slate)}
.center{text-align:center}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;justify-content:center;
  font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent;
  padding:12px 22px;border-radius:999px;transition:.18s;white-space:nowrap;
}
.btn-primary{background:var(--red);color:#fff;box-shadow:0 8px 20px rgba(225,26,60,.28)}
.btn-primary:hover{background:var(--red-dark);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--red);color:var(--red)}
.btn-sm{padding:9px 16px;font-size:14px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:18px;height:var(--header-h)}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand img{height:46px;width:auto}
.brand .tag{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--slate)}
.nav{display:flex;align-items:center;gap:4px;margin-inline-start:auto}
.nav a{
  padding:9px 14px;border-radius:9px;font-weight:500;color:var(--ink);font-size:15.5px;transition:.15s;
}
.nav a:hover{background:var(--bg);color:var(--red)}
.nav a.active{color:var(--red);font-weight:600}
.lang-btn{
  margin-inline-start:6px;background:var(--ink);color:#fff;border:none;border-radius:999px;
  padding:8px 16px;font-weight:600;font-size:13.5px;cursor:pointer;transition:.15s;
}
.lang-btn:hover{background:var(--red)}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;transition:.2s}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 420px at 88% -10%, rgba(225,26,60,.10), transparent 60%),
    radial-gradient(700px 380px at 6% 110%, rgba(15,163,168,.10), transparent 55%),
    #fff;
  border-bottom:1px solid var(--line);
}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;padding-block:64px}
.hero h1{font-size:clamp(30px,4.4vw,50px);line-height:1.1;letter-spacing:-.01em;margin:0 0 16px;font-weight:800}
.hero h1 .accent{color:var(--red)}
.hero p{font-size:clamp(16px,2vw,19px);color:var(--slate);margin:0 0 26px;max-width:46ch}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-art{
  aspect-ratio:4/3;border-radius:20px;background:
    linear-gradient(135deg,#fff,#f0f4f9);
  border:1px solid var(--line);box-shadow:var(--shadow-lg);
  display:grid;place-items:center;position:relative;overflow:hidden;
}
.hero-art .blob{position:absolute;inset:0;background:
  radial-gradient(220px 220px at 30% 30%, rgba(225,26,60,.16), transparent 60%),
  radial-gradient(240px 240px at 75% 70%, rgba(15,163,168,.18), transparent 60%);}
.hero-art .flask{font-size:120px;filter:drop-shadow(0 12px 24px rgba(0,0,0,.12));z-index:1}

/* original graphic banner */
.brand-banner{background:#fff;border-bottom:1px solid var(--line);padding:16px 0}
.brand-banner img{display:block;width:100%;max-width:1000px;height:auto;margin-inline:auto;border-radius:12px}
.hero .hero-text{max-width:780px;margin-inline:auto;text-align:center;padding-block:48px}
.hero .hero-text h1{font-size:clamp(28px,4vw,46px);line-height:1.12;letter-spacing:-.01em;margin:0 0 14px;font-weight:800}
.hero .hero-text p{font-size:clamp(16px,2vw,19px);color:var(--slate);margin:0 auto 24px;max-width:60ch}
.hero .hero-text .hero-cta{justify-content:center}

/* ---------- sections ---------- */
section.block{padding:56px 0}
.block-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:26px}
.block-head h2{font-size:clamp(22px,3vw,30px);margin:0;font-weight:700;letter-spacing:-.01em}
.block-head p{margin:4px 0 0;color:var(--slate)}
.block-head .view-all{color:var(--red);font-weight:600;font-size:15px;white-space:nowrap}

/* ---------- subject grid ---------- */
.subject-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.subject-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 18px;text-align:center;transition:.18s;box-shadow:var(--shadow);
}
.subject-card:hover{transform:translateY(-4px);border-color:var(--red);box-shadow:var(--shadow-lg)}
.subject-card{padding:28px 18px}
.subject-card .ico{display:flex;justify-content:center;margin-bottom:14px}
.subject-card .name{font-weight:600;font-size:16.5px}
.subject-card .count{font-size:13px;color:var(--slate);margin-top:4px}

/* subject icon tiles (crisp SVG, one accent colour each) */
.subj-ico{display:inline-grid;place-items:center;width:66px;height:66px;border-radius:19px;
  background:color-mix(in srgb, var(--ic) 13%, #fff);color:var(--ic);
  box-shadow:inset 0 0 0 1.5px color-mix(in srgb, var(--ic) 24%, #fff);transition:.18s}
.subj-ico svg{width:36px;height:36px}
.subject-card:hover .subj-ico{background:color-mix(in srgb, var(--ic) 18%, #fff);transform:scale(1.05)}
.subj-ico.sm{width:32px;height:32px;border-radius:10px;flex:0 0 auto}
.subj-ico.sm svg{width:19px;height:19px}

/* ---------- age row ---------- */
.age-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.age-card{
  background:linear-gradient(135deg,#fff,#f5f8fc);border:1px solid var(--line);
  border-radius:var(--radius);padding:20px;font-weight:600;display:flex;align-items:center;gap:12px;
  transition:.18s;box-shadow:var(--shadow);
}
.age-card:hover{border-color:var(--red);color:var(--red);transform:translateY(-3px)}
.age-card .num{font-size:22px}

/* ---------- product grid ---------- */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.product-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;transition:.18s;box-shadow:var(--shadow);
}
.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.product-card .thumb{
  aspect-ratio:1/1;background:#fff;display:grid;place-items:center;padding:14px;border-bottom:1px solid var(--line);
}
.product-card .thumb img{max-height:100%;width:auto;object-fit:contain;mix-blend-mode:multiply}
.product-card .thumb.empty{background:linear-gradient(135deg,#f3f6fa,#e9eef5);font-size:46px}
.product-card .body{padding:14px 15px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.product-card .pname{font-weight:600;font-size:15.5px;line-height:1.35}
.product-card .psku{font-size:12.5px;color:var(--slate);font-variant-numeric:tabular-nums}
.product-card .chips{margin-top:auto;display:flex;flex-wrap:wrap;gap:5px;padding-top:8px}
.chip{
  font-size:11.5px;font-weight:500;background:var(--red-soft);color:var(--red-dark);
  padding:3px 9px;border-radius:999px;white-space:nowrap;
}
.chip.ghost{background:#eef2f7;color:var(--slate)}

/* ---------- catalog layout ---------- */
.catalog-wrap{display:grid;grid-template-columns:248px 1fr;gap:28px;align-items:start;padding-block:34px 60px}
.filters{
  position:sticky;top:calc(var(--header-h) + 16px);background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);
}
.filters h3{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--slate);margin:0 0 10px}
.filter-group{margin-bottom:20px}
.search-box{
  width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:10px;font-size:14.5px;
  background:var(--bg);color:var(--ink);
}
.search-box:focus{outline:none;border-color:var(--red);background:#fff}
.filter-list{display:flex;flex-direction:column;gap:4px}
.filter-opt{
  display:flex;align-items:center;gap:9px;padding:8px 11px;border-radius:9px;cursor:pointer;
  font-size:14.5px;transition:.13s;border:1px solid transparent;
}
.filter-opt:hover{background:var(--bg)}
.filter-opt.active{background:var(--red-soft);color:var(--red-dark);font-weight:600}
.filter-opt .ic{width:32px;height:32px;border-radius:10px;display:grid;place-items:center;background:#eef2f7;color:var(--slate);font-size:15px;flex:0 0 auto}
.filter-opt .ct{margin-inline-start:auto;font-size:12px;color:var(--slate)}
.catalog-main .toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.catalog-main .count{color:var(--slate);font-size:15px}
.clear-link{color:var(--red);font-weight:600;font-size:14px;cursor:pointer;background:none;border:none}
.cross-link{display:inline-flex;align-items:center;gap:6px;color:var(--red);font-weight:600;font-size:14.5px;background:var(--red-soft);border:1px solid #f3c4cd;border-radius:999px;padding:8px 16px;transition:.15s}
.cross-link:hover{background:var(--red);color:#fff;border-color:transparent}
.empty-state{text-align:center;padding:60px 20px;color:var(--slate)}
.empty-state .big{font-size:48px;margin-bottom:10px}

/* mobile filter toggle */
.filter-toggle{display:none}

/* ---------- product detail ---------- */
.crumb{padding:22px 0 0;color:var(--slate);font-size:14px}
.crumb a:hover{color:var(--red)}
.detail{display:grid;grid-template-columns:1fr 1fr;gap:40px;padding:24px 0 56px;align-items:start}
.gallery .main-img{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);aspect-ratio:1/1;
  display:grid;place-items:center;padding:26px;box-shadow:var(--shadow);
}
.gallery .main-img img{max-height:100%;object-fit:contain;mix-blend-mode:multiply}
.gallery .main-img.empty{font-size:80px;background:linear-gradient(135deg,#f3f6fa,#e9eef5)}
.thumbs{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.thumbs img{
  width:68px;height:68px;object-fit:contain;background:#fff;border:1px solid var(--line);
  border-radius:9px;padding:6px;cursor:pointer;transition:.15s;mix-blend-mode:multiply;
}
.thumbs img:hover,.thumbs img.active{border-color:var(--red)}
.detail-info h1{font-size:clamp(24px,3.4vw,32px);margin:6px 0 8px;line-height:1.2}
.detail-info .sku-line{color:var(--slate);font-size:14.5px;margin-bottom:14px;font-variant-numeric:tabular-nums}
.detail-info .desc{font-size:16.5px;color:#33414f;margin-bottom:22px}
.tags-row{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:22px}
.info-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin-bottom:16px;box-shadow:var(--shadow)}
.info-card h3{margin:0 0 10px;font-size:16px;display:flex;align-items:center;gap:8px}
.info-card ul{margin:0;padding-inline-start:20px;display:flex;flex-direction:column;gap:6px}
.info-card li{color:#33414f}
.inquire-box{
  background:linear-gradient(135deg,var(--red),#ff4d6a);color:#fff;border-radius:var(--radius);
  padding:22px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  box-shadow:var(--shadow-lg);
}
.inquire-box .it{font-weight:600;font-size:18px}
.inquire-box .btn{background:#fff;color:var(--red)}
.inquire-box .btn:hover{background:#fff;transform:translateY(-1px)}

/* ---------- video embed ---------- */
.video-embed{position:relative;aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;background:#000;box-shadow:var(--shadow)}
.video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.video-item .video-embed{border-radius:var(--radius-sm)}
.video-item .vtitle{font-weight:600;margin-top:10px;font-size:15.5px}

/* ---------- about ---------- */
.about-hero{padding:48px 0 10px}
.about-grid{display:grid;grid-template-columns:1.4fr .9fr;gap:40px;align-items:start;padding-bottom:30px}
.about-text p{font-size:16.5px;color:#33414f;margin:0 0 16px}
.goals-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.goals-card h3{margin:0 0 14px;font-size:19px}
.goals-card ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:14px}
.goals-card li{display:flex;gap:12px;align-items:flex-start;color:#33414f}
.goals-card li .dot{flex:0 0 auto;width:26px;height:26px;border-radius:50%;background:var(--red-soft);color:var(--red);display:grid;place-items:center;font-weight:700;font-size:14px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;padding:30px 0 10px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 20px;text-align:center;box-shadow:var(--shadow)}
.stat .num{font-size:34px;font-weight:800;color:var(--red);line-height:1}
.stat .lbl{color:var(--slate);margin-top:8px;font-size:14.5px}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1.3fr .8fr;gap:34px;align-items:start;padding-block:30px 60px}
.form-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:16px}
.field label{display:block;font-weight:500;font-size:14px;margin-bottom:6px}
.field label .req{color:var(--red)}
.field input,.field textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;
  font-family:inherit;background:var(--bg);color:var(--ink);transition:.15s;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--red);background:#fff}
.field textarea{min-height:120px;resize:vertical}
.field.invalid input,.field.invalid textarea{border-color:var(--red);background:var(--red-soft)}
.form-msg{padding:13px 16px;border-radius:10px;font-weight:500;margin-bottom:16px;display:none}
.form-msg.ok{display:block;background:#e8f7ee;color:#1c7a44;border:1px solid #b9e6c9}
.form-msg.err{display:block;background:var(--red-soft);color:var(--red-dark);border:1px solid #f3c4cd}
.contact-info{display:flex;flex-direction:column;gap:14px}
.info-line{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;display:flex;gap:14px;align-items:center;box-shadow:var(--shadow)}
.info-line .ico{font-size:22px;width:42px;height:42px;border-radius:10px;background:var(--red-soft);display:grid;place-items:center}
.info-line .k{font-size:13px;color:var(--slate)}
.info-line .v{font-weight:600;font-size:17px;font-variant-numeric:tabular-nums;direction:ltr;text-align:start}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#c7d2e0;margin-top:30px}
.footer-inner{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px;padding:46px 0 30px}
.site-footer .brand-f img{height:42px;margin-bottom:12px;filter:brightness(0) invert(1);opacity:.95}
.site-footer p{color:#9fb0c4;font-size:14.5px;margin:6px 0;max-width:38ch}
.site-footer h4{color:#fff;font-size:15px;margin:0 0 14px}
.site-footer ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.site-footer a:hover{color:#fff}
.footer-contact .v{color:#fff;direction:ltr;font-variant-numeric:tabular-nums}
.footer-bottom{border-top:1px solid #2c3a4d;padding:18px 0;font-size:13.5px;color:#8597ab;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* ---------- responsive ---------- */
@media(max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:26px}
  .hero-art{display:none}
  .subject-grid{grid-template-columns:repeat(3,1fr)}
  .product-grid{grid-template-columns:repeat(3,1fr)}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .detail,.about-grid,.contact-grid{grid-template-columns:1fr;gap:24px}
  .catalog-wrap{grid-template-columns:1fr}
  .filters{position:static}
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .nav{display:none}
  .lang-btn{margin-inline-start:auto}
  .menu-toggle{display:block}
  .nav.open{
    display:flex;flex-direction:column;position:absolute;inset-inline:0;top:var(--header-h);
    background:#fff;border-bottom:1px solid var(--line);padding:12px 22px;gap:2px;box-shadow:var(--shadow-lg);
  }
  .nav.open a{padding:12px 10px}
  .subject-grid{grid-template-columns:repeat(2,1fr)}
  .age-row{grid-template-columns:repeat(2,1fr)}
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr;gap:12px}
  .form-row{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  section.block{padding:40px 0}
  .block-head{flex-direction:column;align-items:flex-start;gap:6px}
}